diff mbox series

[v20,36/40] libstdc++: Optimize is_unsigned trait performance

Message ID 20231016001227.2717180-37-kmatsui@gcc.gnu.org
State Unresolved
Headers
Series Optimize type traits performance |

Checks

Context Check Description
snail/gcc-patch-check warning Git am fail log

Commit Message

Ken Matsui Oct. 16, 2023, 12:10 a.m. UTC 
  This patch optimizes the performance of the is_unsigned trait by dispatching
to the new __is_unsigned built-in trait.

libstdc++-v3/ChangeLog:

	* include/std/type_traits (is_unsigned): Use __is_unsigned built-in
	trait.
	(is_unsigned_v): Likewise.

Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
 libstdc++-v3/include/std/type_traits | 13 +++++++++++++
 1 file changed, 13 insertions(+)
diff mbox series

Patch

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 48d630a1478..f7d3815f332 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -1001,10 +1001,17 @@  _GLIBCXX_BEGIN_NAMESPACE_VERSION
     { };
 
   /// is_unsigned
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_unsigned)
+  template<typename _Tp>
+    struct is_unsigned
+    : public __bool_constant<__is_unsigned(_Tp)>
+    { };
+#else
   template<typename _Tp>
     struct is_unsigned
     : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type
     { };
+#endif
 
   /// @cond undocumented
   template<typename _Tp, typename _Up = _Tp&&>
@@ -3440,8 +3447,14 @@  template <typename _Tp>
 
 template <typename _Tp>
   inline constexpr bool is_signed_v = is_signed<_Tp>::value;
+
+#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_unsigned)
+template <typename _Tp>
+  inline constexpr bool is_unsigned_v = __is_unsigned(_Tp);
+#else
 template <typename _Tp>
   inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
+#endif
 
 template <typename _Tp, typename... _Args>
   inline constexpr bool is_constructible_v = __is_constructible(_Tp, _Args...);